curiosity

• out of curiosity

  Usually it's out of curiosity.

• natural curiosity

  Forgive an old man's natural curiosity.

• old curiosity

• insatiable curiosity

  His insatiable curiosity and desire for experiment had led to his election as a Fellow of the Royal Society.

• curiosity shop

  It was like stepping from the main street into a cobbled alley's curiosity shop — that shock of surprise to discover again what an intricate and peculiar organ the imagination is, what extravagant uses it has found for time.

• intellectual curiosity

  have great intellectual curiosity;

• idle curiosity

  Perhaps it was nothing more than idle curiosity.

• curiosity killed

  Perhaps this is the origin of the old expression ‘curiosity killed the cat’?

• scientific curiosity

  It is useless for me to point out that scientific curiosity by itself is as irresponsible as the curiosity of a child.